Building extrusion



FIG. 1 is a front end view of a building extrusion, showing our new design;

FIG. 2 is a back end view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a front, top and left side perspective view thereof. 

CLAIM The ornamental design for a building extrusion, as shown and described. 